聚丙烯酰胺—钠基复合膨润土合成及其吸附铅离子性能  

Synthesis of Polyacrylamide Na-bentonite Composite and Its Adsorption to Lead Ion

作　　者：杜秀娟[1] 曹吉林[1] 陈学青[1] 赵建军[1] 

机构地区：[1]河北工业大学化工学院,绿色化工与高效节能河北省重点实验室,天津300130

出　　处：《过程工程学报》2012年第2期324-329,共6页The Chinese Journal of Process Engineering

基　　金：天津市科技支撑计划重点资助项目(编号:10ZCKFSH01900)

摘　　要：以丙烯酰胺为聚合单体,钙基膨润土为主要原料,采用钠化改性及水溶液聚合连续工艺合成了系列复合膨润土,对其进行了表征,并考察了丙烯酰胺的溶出量和对Pb2+的吸附性能.结果表明,丙烯酰胺在膨润土层间发生了插层聚合,复合膨润土为片层结构,稳定性较好.复合膨润土对Pb2+的吸附量高于粉末膨润土和钙基复合膨润土,且吸附量随膨润土含量增加而增加,膨润土含量为90%的钠基复合膨润土对Pb2+的吸附量可达118.35mg/g,吸附符合Lagergren二级动力学模型.Polyacrylamide Na-bentonite composite was prepared by continuous process in which Ca-bentonite was modified by NaCO3 and then polymerized with polyacrylamide in aqueous solution. The composite was characterized by XRD, SEM, IR and TG-DTG-DSC. The adsorption experiments of the composite to Pb2＋ and admeasurement of acrylamide monomer were investigated. The results showed that acrylamide intervened and polymerized in the layers of bentonite. The composite bentonite presented a lamellar structure and had better stability. The adsorption capacity of Na-bentonite composite was better than that of powder bentonite and Ca-bentonite composite, and increase with the rise of bentonite content. The adsorption capacity of composite Na-bentonite containing 90% Na-bentonite was 118.35 mg/g. The adsorption of Na-bentonite composite to Pb2＋ was corresponding with a second-order kinetic model.

关 键 词：钠基膨润土 丙烯酰胺 聚合反应 铅离子 吸附 

分 类 号：TB332[一般工业技术—材料科学与工程]